Abstract
A principal-component analysis of the Minnesota Multiphasic Personality Inventory (MMPI) item pool by Johnson, Butcher, Null, and Johnson (1984) resulted in 21 factor scales. An independent analysis of the MMPI item pool by Costa, Zonderman, McCrae, and Williams (1985) resulted in 9 factor scales. In this study, we report two analyses. In the first analysis, we scored the MMPI and an Experimental Multiphasic Personality Inventory (EMPI) for the Johnson et al. 21 factor scales and a well-established marker scale for the first MMPI factor, the MMPI Social Desirability (SD) scale. In the second analysis, we scored the MMPI and the EMPI for the Costa et al. 9 factor scales and the SD scale. In both analyses, the first-factor loadings of the scales, when scored in both the MMPI and the EMPI, were highly congruent. In both analyses, the SD scale proved to be an excellent marker variable for the first factor.
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